I have two win2003 32-bit domain controllers and i want to replace one of them with a win2003 R2 64bit domain controller. Is there anything I should be aware of? If possible, step-by-step instructions would be very very appreciated. I've read articles saying that I just need to rund "adprep" and "dcpromo" but I'm not sure if it's just as simple as that when it comes to Active Directory.

Yes. I thought about 2008 R2 but the budget doesn't allow me to purchase the CALs. Is it true that CALS for win2003 are not transferrable to win2008? I'll try "adprep" and "dcpromo" and will let you know the result. Thanks for a very quick response.

Be sure that you move all important roles to the DC controller that yoú won't touch.
Global Catalog, + the FSMO roles.
These are the heart of you're domain and shouldnt be deleted by a format c:...
In this article you will find commands to check where the GC and the fsmo roles are..http://www.block.net.au/help/Replace-DC/

And when you sure those roles are there, then it's quite easy indeed.
And, why not win2008 ?

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